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;;; ob-fortran.el --- org-babel functions for fortran
;; Copyright (C) 2011-2013 Free Software Foundation, Inc.
;; Authors: Sergey Litvinov
;; Eric Schulte
;; Keywords: literate programming, reproducible research, fortran
;; Homepage: http://orgmode.org
;; This file is part of GNU Emacs.
;;
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; Org-Babel support for evaluating fortran code.
;;; Code:
(require 'ob)
(require 'cc-mode)
(declare-function org-entry-get "org"
(pom property &optional inherit literal-nil))
(declare-function org-every "org" (pred seq))
(defvar org-babel-tangle-lang-exts)
(add-to-list 'org-babel-tangle-lang-exts '("fortran" . "F90"))
(defvar org-babel-default-header-args:fortran '())
(defvar org-babel-fortran-compiler "gfortran"
"fortran command used to compile a fortran source code file into an
executable.")
(defun org-babel-execute:fortran (body params)
"This function should only be called by `org-babel-execute:fortran'"
(let* ((tmp-src-file (org-babel-temp-file "fortran-src-" ".F90"))
(tmp-bin-file (org-babel-temp-file "fortran-bin-" org-babel-exeext))
(cmdline (cdr (assoc :cmdline params)))
(flags (cdr (assoc :flags params)))
(full-body (org-babel-expand-body:fortran body params))
(compile
(progn
(with-temp-file tmp-src-file (insert full-body))
(org-babel-eval
(format "%s -o %s %s %s"
org-babel-fortran-compiler
(org-babel-process-file-name tmp-bin-file)
(mapconcat 'identity
(if (listp flags) flags (list flags)) " ")
(org-babel-process-file-name tmp-src-file)) ""))))
((lambda (results)
(org-babel-reassemble-table
(org-babel-result-cond (cdr (assoc :result-params params))
(org-babel-read results)
(let ((tmp-file (org-babel-temp-file "f-")))
(with-temp-file tmp-file (insert results))
(org-babel-import-elisp-from-file tmp-file)))
(org-babel-pick-name
(cdr (assoc :colname-names params)) (cdr (assoc :colnames params)))
(org-babel-pick-name
(cdr (assoc :rowname-names params)) (cdr (assoc :rownames params)))))
(org-babel-trim
(org-babel-eval
(concat tmp-bin-file (if cmdline (concat " " cmdline) "")) "")))))
(defun org-babel-expand-body:fortran (body params)
"Expand a block of fortran or fortran code with org-babel according to
it's header arguments."
(let ((vars (mapcar #'cdr (org-babel-get-header params :var)))
(main-p (not (string= (cdr (assoc :main params)) "no")))
(includes (or (cdr (assoc :includes params))
(org-babel-read (org-entry-get nil "includes" t))))
(defines (org-babel-read
(or (cdr (assoc :defines params))
(org-babel-read (org-entry-get nil "defines" t))))))
(mapconcat 'identity
(list
;; includes
(mapconcat
(lambda (inc) (format "#include %s" inc))
(if (listp includes) includes (list includes)) "\n")
;; defines
(mapconcat
(lambda (inc) (format "#define %s" inc))
(if (listp defines) defines (list defines)) "\n")
;; body
(if main-p
(org-babel-fortran-ensure-main-wrap
(concat
;; variables
(mapconcat 'org-babel-fortran-var-to-fortran vars "\n")
body) params)
body) "\n") "\n")))
(defun org-babel-fortran-ensure-main-wrap (body params)
"Wrap body in a \"program ... end program\" block if none exists."
(if (string-match "^[ \t]*program[ \t]*.*" (capitalize body))
(let ((vars (mapcar #'cdr (org-babel-get-header params :var))))
(if vars (error "Cannot use :vars if 'program' statement is present"))
body)
(format "program main\n%s\nend program main\n" body)))
(defun org-babel-prep-session:fortran (session params)
"This function does nothing as fortran is a compiled language with no
support for sessions"
(error "Fortran is a compiled languages -- no support for sessions"))
(defun org-babel-load-session:fortran (session body params)
"This function does nothing as fortran is a compiled language with no
support for sessions"
(error "Fortran is a compiled languages -- no support for sessions"))
;; helper functions
(defun org-babel-fortran-var-to-fortran (pair)
"Convert an elisp val into a string of fortran code specifying a var
of the same value."
;; TODO list support
(let ((var (car pair))
(val (cdr pair)))
(when (symbolp val)
(setq val (symbol-name val))
(when (= (length val) 1)
(setq val (string-to-char val))))
(cond
((integerp val)
(format "integer, parameter :: %S = %S\n" var val))
((floatp val)
(format "real, parameter :: %S = %S\n" var val))
((or (integerp val))
(format "character, parameter :: %S = '%S'\n" var val))
((stringp val)
(format "character(len=%d), parameter :: %S = '%s'\n"
(length val) var val))
;; val is a matrix
((and (listp val) (org-every #'listp val))
(format "real, parameter :: %S(%d,%d) = transpose( reshape( %s , (/ %d, %d /) ) )\n"
var (length val) (length (car val))
(org-babel-fortran-transform-list val)
(length (car val)) (length val)))
((listp val)
(format "real, parameter :: %S(%d) = %s\n"
var (length val) (org-babel-fortran-transform-list val)))
(t
(error (format "the type of parameter %s is not supported by ob-fortran"
var))))))
(defun org-babel-fortran-transform-list (val)
"Return a fortran representation of enclose syntactic lists."
(if (listp val)
(concat "(/" (mapconcat #'org-babel-fortran-transform-list val ", ") "/)")
(format "%S" val)))
(provide 'ob-fortran)
;;; ob-fortran.el ends here
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